Drive for refuse loaders



' June 16, 1942. c c. OTTIOSON DRIVE FOR REFUSE LOADERS 2 Sheets-Sheet 1 Filed Dec. 6, 1940 Patented June 16, 1942 UNETE T OFFICE 2,286,925 DRIVE ro e across LOADERS Carl C. Qttoson, Staten Island, N. Y. Application December 6, 1940, Serial No. 368,935 5 Claims (01. 214-67) This invention relates to refuse collecting trucks of the type having a body pivoted on the chassis of the truck for dumping, this dump'body being provided with an endless conveyor having a downward extension. The invention is an improved form of hydraulic drive for the endless conveyor.

Refuse collecting trucks of the type here involved are shown in application Ser. No. 156,782, filed July 31, 1937, and in Patent No. 2,224,789, granted December 10, 1940, in the names of boron G. Kurtz and Carl C. Ottoson.

In Ser. No. 156,782, the drive for the endless conveyor is purely mechanical, the power for driving the conveyor being derived preferably from the motor of the truck, and being conveyed through shafts, gears and a clutch to the head end of the conveyor located in the upper part of the dump body. The clutch automatically engages and disen'gages as the body is lowered and raised.

In Patent 2,224,789, the drive for the conveyor is hydraulic, the hydraulic driving motor being located in the upper part of the truck body, at the head end of the conveyor, for driving it. The pump for supplying the pressure fluid is located on the chassis of the truck and the pressure fluid is led through pipes, which are arranged to pass near the pivotal axis of the dump body, to the hydraulic motor.

The present invention involves certain features of both the foregoing applications, in that it utilizes an automatically operating clutch as in Ser. No. 156,782 and utilizes a hydraulic driving motor at the head end of the conveyor, as in Patent 2,224,789.

The hydraulic drive, as fully explained in Patent 2,224,789, presents a number of important advantages and the combination of the present invention may be used for transforming a mechanical drive of the type shown in Ser. No. 156,782 to a hydraulic drive of the type shown in Patent 2,224,789. The two main advantages of the hydraulic drive are easy and quick reversibility, by means of a reversing valve, to dislodge material that might jam the conveyor, and the avoidance of any breakage of parts due to jamming of the conveyor, such jamming resulting in simply a building up of fluid pressure which is taken care of by a by-pass overload valve.

According to the present invention, the conveyor is driven by a hydraulic motor; the pump for driving this motor is located on and carried by the pivoted dump body and the power for driving this pump is supplied by a power takeoff on the chassis of the truck engaging with a suitable clutch and drive'shaft on the pivoted dump body, the clutch elements automatically engaging and disengaging, respectively, when the dump body is lowered and raised. The present arrangement eliminates a considerable amount of the piping used in Patent 2,224,789 and yet it has the advantages of the hydraulic drive.

The invention will be further described in connectionwith the accompanying drawings illustrating the present preferred embodiment thereof, in which:

Figure 1 is a side elevation of the truck showing my improved drive; and

Figure'2 is a side View on an enlarged scale showing the hydraulic drive and cooperating parts.

Referring now to these drawings, in which similar reference characters indicate similar parts, the truck comprises a chassis 2 on which the body 4 is pivoted near its rear end for rearward dumping, as is well understood in this art. The body 4 is provided with a downward extention 6 terminating in a loading boot 8, in which extension there is an endless conveyor, the forward end of the conveyor, indicated at 19, passing about driving wheels located on the shaft l2. Mounted on the shaft I2 is a worm wheel which is driven by a worm located in the casing [4, the worm being driven by any suitable type of hydraulic motor indicated generally at [6. The motor l5 and cooperating parts are mounted on a frame indicated generally at H! which may be resiliently mounted by springs 28 and stirrups 22 bearing against the standards 24, as shown in application Ser. No. 156,782, or they may be adjustably mounted without springs, as shown in application Ser. No. 334,288, filed May 9, 1940.

The parts thus far described are all shown in one or more of prior applications Ser. No. 156,782, and 334,288, mentioned above, and Patent 2,224,789 and reference is made thereto for further details.

Connected to the hydraulic motor 16 are two pipes 26 and 2B which are connected to a reversing valve 30, by means of which pressure fluid may be applied to either of said pipes, the other pipe acting as the return, so that the hydraulic motor can be driven in either direction. The preferred construction of the reversing valve is shown in Figures 7, 8 and 9 of Patent 2,224,789. In case the conveyor becomes jammed, a short reversal, or a series of successive short reversals, is very efficacious in breaking the jam.

Fluid under pressure is supplied 'to the reversing valve 38 from the pipe 32, the valve being arranged to supply fluid under pressure to either 26 or 28, as the case may be, while the other pipe acts as a return. When the valve is in neutral position, the fluid under pressure is shut off from both pipes 26 and 28 and is bypassed back to the fluid reservoir 34 by means of the pipe 36. The details of this reversing valve are fully described in Patent 2,224,789 and are shown in Figures 7, 8 and 9 of that patent, and reference is made to that application for such details. The valve 30 is put in forward, reverse or neutral by a control rod 3|. Moreover, any suitable type of reversing valve could be used for accomplishing the above noted operations. The reversing valve also is provided with a spring a minimum amount of piping from the pump to the hydraulic motor. Furthermore, according to loaded by-pass for relieving excess pressure, all

as described in Patent 2,224,789.

The means for supplying fluid under pressure to the pipe 32 will now be described. Pipe 32 is connected to the pump 31, the suction side of the pump being connected to the fluid reservoir 34 by the pipe 38. The pump 31, which is any suitable type of rotary pump, is driven by the downwardly extending shaft 48 which passes. through a suitable bearing 42 and is connected to. the upper part of a clutch 44, the lower part of which is indicated at 44'. A spring 46 serves to resiliently press the clutch jaw 44 into engagement with clutch jaw 44' and to prevent breakage of the parts as they come into engagement. The upper and lower portions of the clutch may be chamfered or beveled to guide them into accurate alignment.

The lower portion of the clutch. M is carried at the upper end of a shaft 47, which in turn is driven by the power take-off assembly indicated generally at 48, all as illustrated in more detail in application Ser. No. 156,782.

With the parts as shown in Figure 2 and the motor of the truck running, power is supplied from the power take-off 48 through the clutch to shaft 48 and to pump 31. Depending on the position of the valve 38, the hydraulic motor I5 is driven in either direction or, if the valve is in neutral position, the fluid from the pump will by-pass through the valve back to the reservoir 34. When the hydraulic motor is operating, fluid passes. from the pump to valve 38 and then to the motor through pipe 28 or 28, back through pipe 28 or 25, and to the valve 33, and thence to pipe 38 and reservoir 34. In other words, when the body 4 is in the lowered position, the pump 37 will be driven and the conveyor will be operated in either direction, or

the teachings of the present invention, the mechanical drive of Ser. No. 156,782 can be changed over quite readily to the hydraulic drive of Patent 2,224,789, with no alteration in the basic design of the truck.

I claim as my invention:

1. In a refuse collecting truck comprising a chassis and a body pivoted thereon for dumping, the combination of a hydraulic motor carried by said pivoted body, for driving anv endless conveyor, a pump on the pivoted body for driving said hydraulic motor, and means including coopcrating clutch members, carried by the pivoted body and by the chassis, for transmitting power from the chassis of the truck to said pump.

2. In a refuse collecting truck comprising a chassis and a body pivoted thereon for dumping, the combination of a hydraulic motor carried b said pivoted body, for driving an endless conveyor, a pump on the pivoted body for driving said hydraulic motor, and means including cooperating clutch members, which automatically disengage and engage, respectively, when the pivoted body is raised or lowered, for transmitting power from the chassis to the pump when the body is in the lowered position.

3. In a refuse collecting truck comprising a chassis and a body pivoted thereon for dumping, the combination of a hydraulic motor carried by said pivoted body, for driving an endless conveyor, means for reversing the. flow of fluid through the motor for reversing its direction of drive, a pump on the pivoted body for driving said hydraulic motor, and means including cooperating clutch members, carried by the pivoted body and by the chassis, for transmitting power from the chassis of the truck to said pump.

4. In a refuse collecting truck comprising a chassis and a body pivoted thereon for dumping, the combination of .a hydraulic motor carried by the body, for driving an endless conveyor, means including a reversing valve and operating means therefor, for reversing the direction of rotation of said hydraulic motor, a pump on the pivoted body for driving said hydraulic motor, and means including cooperating clutch members, which automatically disengage and engage, respectively, when the pivoted body is raised or lowered, for transmitting power from the chassis to the'pump when the body is in the lowered position.

5. An automotive vehicle having a body pivoted thereon for dumping, an endless conveyor carried by said pivoted body for loading it, a hydraulic motor, carried on said pivoted body, for driving said conveyor, a pump on the pivoted body for driving said motor, and means, including a clutch, for transmitting power from the chassis to said pump, said clutch becoming automatically disengaged when the pivoted body is raised for dumping it.

CARL C. OTTOSON. 

